Add Android apk SDK source code

android

2024-07-25 2dcf9cc893a27c50d538baf8b5d47ff06fe495d8

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package com.example.serial; 
import androidx.appcompat.app.AppCompatActivity; 
 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 
 
public class BuzzerActivity extends AppCompatActivity { 
 
    private Button play; 
    private Button stop; 
    private EditText period; 
    private EditText duty_cycle; 
 
    private String periodBuf; 
    private String dutyBuf; 
    private BuzzerControl buzzerControl; 
    private int rv; 
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_buzzer); 
        buzzerControl = new BuzzerControl(); 
 
        play = findViewById(R.id.play); 
        period = findViewById(R.id.period); 
        duty_cycle = findViewById(R.id.duty_cycle); 
        stop = findViewById(R.id.stop); 
 
 
        play.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                periodBuf = period.getText().toString(); 
                dutyBuf = duty_cycle.getText().toString(); 
 
                if(periodBuf.isEmpty() || dutyBuf.isEmpty()){ 
                    periodBuf = period.getHint().toString(); 
                    dutyBuf = duty_cycle.getHint().toString(); 
                    period.setText(periodBuf); 
                    duty_cycle.setText(dutyBuf); 
                } 
                // 打开pwmchip2/pwm0 
                rv = buzzerControl.pwmOpen("2"); 
                if (rv == 1) { 
                    // 表示缺少权限 
                    Toast.makeText(BuzzerActivity.this, "请添加/sys/class/pwm/pwmchip2/export的权限", Toast.LENGTH_SHORT).show(); 
                }else if( rv < 0 ){ 
                    Toast.makeText(BuzzerActivity.this, "打开PWM失败", Toast.LENGTH_SHORT).show(); 
                } else { 
                    // 首先设置周期 
                    rv = buzzerControl.pwmConfig("period", periodBuf); 
                    if (rv == 1) { 
                        // 表示缺少权限 
                        Toast.makeText(BuzzerActivity.this, "请添加/sys/class/pwm/pwmchip2/pwm0/period的权限", Toast.LENGTH_SHORT).show(); 
                    } else if (rv == 2) { 
                        Toast.makeText(BuzzerActivity.this, "周期的值无效，请重新输入", Toast.LENGTH_SHORT).show(); 
                    }else if (rv < 0) { 
                        Toast.makeText(BuzzerActivity.this, "设置周期失败", Toast.LENGTH_SHORT).show(); 
                    }else { 
                        // 其次设置占空比 
                        rv = buzzerControl.pwmConfig("duty_cycle", dutyBuf); 
                        if (rv == 1) { 
                            // 表示缺少权限 
                            Toast.makeText(BuzzerActivity.this, "请添加/sys/class/pwm/pwmchip2/pwm0/duty_cycle的权限", Toast.LENGTH_SHORT).show(); 
                        } else if (rv == 2) { 
                            Toast.makeText(BuzzerActivity.this, "占空比的值无效，请重新输入", Toast.LENGTH_SHORT).show(); 
                        } 
                        if (rv < 0) { 
                            Toast.makeText(BuzzerActivity.this, "设置占空比失败", Toast.LENGTH_SHORT).show(); 
                        } else { 
                            // 最后使能pwm 
                            rv = buzzerControl.pwmConfig("enable", "1"); 
                            if (rv == 1) { 
                                // 表示缺少权限 
                                Toast.makeText(BuzzerActivity.this, "请添加/sys/class/pwm/pwmchip2/pwm0/enable的权限", Toast.LENGTH_SHORT).show(); 
                            } else if (rv < 0) { 
                                Toast.makeText(BuzzerActivity.this, "使能PWM失败", Toast.LENGTH_SHORT).show(); 
                            } else 
                                Toast.makeText(BuzzerActivity.this, "打开PWM, 正在播放", Toast.LENGTH_SHORT).show(); 
                        } 
                    } 
                } 
            } 
        }); 
 
        stop.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                rv = buzzerControl.pwmConfig("enable", "0"); 
                if(  rv < 0 || rv == 1 || rv == 2) 
                    Toast.makeText(BuzzerActivity.this, "禁止PWM失败", Toast.LENGTH_SHORT).show(); 
                else { 
                    Toast.makeText(BuzzerActivity.this, "禁止PWM，暂停播放", Toast.LENGTH_SHORT).show(); 
                } 
            } 
        }); 
 
    } 
}